Search Results Use the search box below to revise your search, or start a new search. Studies (2) Variables Publications Your query returned 2 studies. Sort by: Title A-Z Released/Updated Time Period Most Cited in ICPSR Bib. 1. Aging of Veterans of the Union Army: Military, Pension, and Medical Records, 1820-1940 (ICPSR 6837) Fogel, Robert W., et al. 2. Aging of Veterans of the Union Army: United States Federal Census Records, 1850, 1860, 1900, 1910 (ICPSR 6836) Fogel, Robert W., et al.